• Power supply companies.
  • Power stations.
  • Cement industry.
  • Automotive industry.
  • Iron and steel works.
  • Windmills.
  • Mining industry.
  • Textile, paper and food industries.
  • Chemical industry.
  • Petroleum industry.
  • Pipeline installations.
  • Offshore installations.
  • Electrochemical plants.
  • Petrochemical plants.
  • Shipbuilding industry.
  • Diesel power plants.
  • Emergency power supply installations.
  • Lignite open-castmines.
  • Traction power supply systems.


TPR6 is a complete ring main unit range suitable for all the switching operations in 40,5kV, secondary distribution network.
Operating safely in a distribution network requires different switching points to obtain maximum service continuity in case of fault on the network.

Construction Characteristics

TPR6 is a completely “sealed for life” system with a stainless steel tank containing all live parts and switching devices. A hermetically sealed steel tank from the outside environment ensures a high level of reliability as well as personal safety. The structure can withstand the electrodynamics stresses during the operation.
The operating mechanism, movable mimic and voltage signaling lamps are positioned in the front panel. Switches are operated by means of spring-operated mechanisms.
Movable mimic gives the position of the switch whereas the voltage signaling lamp indicates the voltages. Fuses and cable compartment are easily accessible through the front door which is interlocked with the earth switch. Should the low voltage auxiliary compartment be present, it is situated above the ring main unit.

Technical Data

Main Characteristics
Insulation Voltage Up to 40.5 kV
Rated Frequancy 50 – 60 Hz
Rated Short time withstand current Ik Up to 25 kA
Rated duration of short circuit tk 1 – 3 s
Degree of protection on front face Indoor : IP 3X – 41
Outdoor : IP 54 – 55